[PATCH 03/18] Delayed arm setup of PCI IRQs to bus scan time

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Vality <matt@xxxxxxxxxxxx>

Currently PCI device IRQs under arm are initialised during the
pci_common_init_dev code path, this results in an extra sweep of the
PCI bus as well as causing PCI devices hot-plugged after boot to not
receive an IRQ.

This patch set defers this assignment untill the device enable phase
which prevents both these issues.

---
 arch/arm/kernel/bios32.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 17a26c1..4dcf3f7 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -389,7 +389,7 @@ void pcibios_remove_bus(struct pci_bus *bus)
  * PCI standard swizzle is implemented on plug-in cards and Cardbus based
  * PCI extenders, so it can not be ignored.
  */
-static u8 pcibios_swizzle(struct pci_dev *dev, u8 *pin)
+u8 pcibios_swizzle(struct pci_dev *dev, u8 *pin)
 {
 	struct pci_sys_data *sys = dev->sysdata;
 	int slot, oldpin = *pin;
@@ -409,7 +409,7 @@ static u8 pcibios_swizzle(struct pci_dev *dev, u8 *pin)
 /*
  * Map a slot/pin to an IRQ.
  */
-static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct pci_sys_data *sys = dev->sysdata;
 	int irq = -1;
@@ -424,6 +424,13 @@ static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	return irq;
 }
 
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+	bridge->swizzle_irq = pcibios_swizzle;
+	bridge->map_irq = pcibios_map_irq;
+	return 0;
+}
+
 static int pcibios_init_resources(int busnr, struct pci_sys_data *sys)
 {
 	int ret;
@@ -523,8 +530,6 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
 	if (hw->postinit)
 		hw->postinit();
 
-	pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);
-
 	list_for_each_entry(sys, &head, node) {
 		struct pci_bus *bus = sys->bus;
 
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux